Danfoss PVED-CLS, User Manual

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© Danfoss | August 2018 AQ00000211 |
179
ENGINEERING TOMORROW
Closed loop dead-band calibration
Figure 770 shows a possible implementation of the calibration procedure and the associated functions which shall be
performed by the calibration tool.
The PVED-CLS shall be put in “Service mode – direct output control”. Two initial test spool position set-points
(test_db_R and test_db_L) shall be used. The calibration procedure will first initialize the steered wheels to the wheel
angle given by Calib_WA_R.
After this step, the steered wheels will attempt to steer between the wheel angles given by Calib_WA_R and
Calib_WA_L. The time it takes from one side to the other is measured and stored in TR and TL.
Figure 70
While the calibration algorithm is executed, the calibration tool shall continuously capture TR and TL and individually
evaluate these values against the success criteria. The calibration tool shall individually adjust test_db_R and test_db_L
until the calibration success criteria is met. When success criteria are met the closed-loop dead-band can directly be
derived as follows:
test_db_L = test_cl_db_L = P3166
test_db_R = test_cl_db_R = P3168
Table 89